I bought a 2009 Chev. Silverado 2500HD Diesel. I have less than 3000 miles on it, and have noticed the famous steering column rattle every time the truck hits the slightest bump. I am no sure if this is serious or not, but I will take it to my dealer and see about getting it resolved. i purchased an extended warranty, so this should be no problem. From what I understand, this is an ongoing problem with GM. We'll see.....